Re: [Healeys] Thread Size for Overdrive operating Valve Plug

[Bob Haskell <rchaskell@earthlink.net>]

I made an adapter to 1/4" NPT years ago. Looks like the thread is 
1/2"-20.  Mine measured 0.495".  Michael has the right idea, that allows 
you to keep the ball and spring in place and measure the pressure under 
normal operation.

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 5/23/20 2:26 PM, jpaynepbr@cox.net wrote:
> Anybody know what the official size designation and thread is for the 
> Overdrive Operating Valve Plug?
> 
> Trying to fit up a pressure gauge, and having issues finding the right 
> adapter.  The Major OD of the plug is .49?, and the British standard 
> pipe taper and parallel major OD is .51?, so they aren?t going in.
> 
> Thanks,
> 
> Jonas
> 
> 
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